Hopefully fixed Stress lowering dialogue not firing sometimes.
If you missed it, you can:
Go to folder %APPDATA%/Godot\app_userdata\My Dragon Idol.
Edit auto.sav even with Notepad. Change "stress" to 99 / 199 / 299 for each of 3 scenes, start the game and play single stat, that should trigger the scene and unlock missing entries in Gallery.